How to make a tab when outputting a line?

Question

PHP

There is a line containing html tags and text between them, how to output with tabbed tags?
From

$str = "<li><a>Вход</a></li><li><a>Регистрация</a></li><li><a>Корзина</a></li>";

Do this
upd: output character by character

for ($i=0;$i<strlen($str)-1;$i++) {
     echo $str[$i];
}

Answer 1

There is such a thing
Used on this site and many other
places Google more for the word parsing

Answer 2

Learn CSS: margin, padding.